Clinical and radiographical outcomes of the K-MOD PS total knee prosthesis: a retrospective analysis of 178 cases

Introduction. The demand for primary total knee prosthesis is growing globally with an annual rate ranging from 5% to 17%, representing the most valid solution in patients with advanced osteoarthritis, providing significant pain relief and an overall improvement in quality of life. Over the years, the evolution of knee prosthetic surgery has led to the development of numerous types of implants, different in materials in design philosophies and surgical approach, with the aim of ensuring the improvement of joint functionality, duration and better adaptation to the patient. The differences concern, for example, the degree of constraint, whether or not the posterior cruciate ligament is preserved and the type of osteointegration. Among the various proposals, PS prostheses are still the most used alternative, based on the “cam-post” system, guaranteeing an improvement of the ROM and a femoral rollback. Objectives. The aim of this study is to report the clinical and radiographic results of the Biompianti K-MOD PS total knee prosthesis. Materials and methods. 190 prosthesis implanted between September 2019 and January 2024 were evaluated in 181 patients. The outcome was evaluated through the presence of painful symptomatology, ROM and radiographic aspect, evaluating the presence of possible complications such as mobilization and infection.Results. Among the 190 implants, 178 were considered for follow up. The 178 prostheses were analyzed retrospectively with an average follow-up of 2.7 years (minimum 7 months, maximum 5 years, SD 1.3). The 88.8% obtained an improvement of the painful symptomatology and a satisfactory final ROM with no signs of mobilization at the radiographic control. 11.2% had complications, including the persistence of painful symptoms with ROM limitation (75%) and aseptic mobilization in 2 cases (10%); a single case of infection and one case of instability to varo-valgus stress were documented.Conclusions. This study showed an excellent outcome in terms of improved painful symptoms and ROM recovery associated with a low incidence of complications.